CN219774741U

CN219774741U - Plastic pulley assembly

Info

Publication number: CN219774741U
Application number: CN202321192207.4U
Authority: CN
Inventors: 储为将
Original assignee: Ningbo Yongqing New Material Technology Co ltd
Current assignee: Ningbo Yongqing New Material Technology Co ltd
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-09-29
Anticipated expiration: 2033-05-15

Abstract

The utility model discloses a plastic pulley assembly, comprising: the hub is formed by injection molding, the periphery of the hub is provided with a ring concave part, the bottom of the ring concave part is an annular bottom surface, and the annular bottom surface is arc-shaped along the axial section of the hub; and the flexible ring is sleeved on the periphery of the hub and is provided with a first inner periphery matched with the ring concave part. The utility model provides a plastic pulley assembly, which changes the cross section of the annular bottom surface of a ring concave part from a plane in the prior art into an arc shape, so as to increase the binding force between the inner diameter of a flexible ring and a hub, reduce the probability of gaps generated by axial movement of the flexible ring relative to the hub, reduce the probability of noise occurrence and prolong the service life.

Description

Plastic pulley assembly

Technical Field

The utility model relates to the technical field of pulleys, in particular to a plastic pulley assembly.

Background

For movable household appliances such as dust collectors or sweeping robots, the most common movement scheme is to add a pulley assembly at the bottom of the machine. The initial pulley assembly typically employs a metal hub encased with a rubber tire. With the development of the plastic industry, the industry components adopt injection molded hubs to replace metal hubs. The pulley assembly is typically manufactured by placing a molded hub member in the form of an insert into a mold and forming the tire structure on the hub surface by a compression molding process. As in the chinese patent of patent CN201260802Y, a pulley for a drawer of a disinfection cabinet is disclosed, wherein the joint surface of the hub and the pulley sleeve is a plane distributed in a ring shape, the joint capability of the hub and the pulley sleeve is poor, and when the pulley sleeve collides laterally, the pulley sleeve is easy to move axially relative to the hub to generate a gap. Bacteria are easy to breed after entering water stains in the gaps, and noise of the pulley assembly is easy to increase.

Disclosure of Invention

The present utility model aims to solve one of the technical problems in the related art to a certain extent. Therefore, the utility model provides a plastic pulley assembly, which changes the cross section of the annular bottom surface of the annular concave part from a plane in the prior art to an arc shape, so as to increase the binding force between the inner diameter of the flexible ring and the hub, reduce the probability of generating gaps due to axial movement of the flexible ring relative to the hub, reduce the probability of generating noise factors and prolong the service life.

The technical scheme adopted by the utility model is as follows: there is provided a plastic pulley assembly comprising:

the hub is formed by injection molding, the periphery of the hub is provided with a ring concave part, the bottom of the ring concave part is an annular bottom surface, and the annular bottom surface is arc-shaped along the axial section of the hub;

and the flexible ring is sleeved on the periphery of the hub and is provided with a first inner periphery matched with the ring concave part.

The bottom surface of the ring concave part in the prior art is a plane distributed in an annular shape, and the axial combination capability between the rigid hub and the flexible ring is poor. The cross section of the annular bottom surface of the annular concave part is arranged into an arc shape, so that the binding force between the inner diameter of the flexible ring and the hub is increased, and the probability of gaps generated by axial movement of the flexible ring relative to the hub is reduced. And because the existence of the arc annular bottom surface leads to the thickness inequality between the first inner periphery on the flexible ring to the outer peripheral surface, can increase the vibration attenuation of flexible ring, reduce the emergence probability of plastic pulley assembly noise cause.

According to one embodiment of the utility model, the flexible ring is made of polyurethane foam material or nitrile rubber foam material; both materials have the following advantages: 1. the insulating performance is good, and various energy transmission modes such as heat insulation, electricity, sound and the like can be effectively isolated; 2. good weather resistance, and can keep good performance for a long time under severe environmental conditions; 3. good compression resistance, and can bear larger pressure without deformation or rupture; 4. good shock absorption performance, and can effectively reduce shock and noise; 5. the wear resistance is good, and the service life of the plastic pulley assembly can be effectively prolonged.

According to one embodiment of the utility model, the thickness between the first inner periphery and the outer peripheral surface of the flexible ring gradually decreases from two sides to the center along the axial direction of the flexible ring; namely, the arc shape of the annular bottom surface is an arc-shaped structure protruding from inside to outside.

According to one embodiment of the utility model, two ends of the flexible ring are provided with second inner peripheral edges, the inner diameter of the second inner peripheral edges is matched with the outer peripheral edge of the hub, and the joint of the first inner peripheral edges and the second inner peripheral edges forms a step surface; the arrangement of the second inner periphery can shield the joint surface between the step surface and the hub, and the gap water inflow generated at the joint is avoided.

According to one embodiment of the utility model, the side walls on two sides in the axial direction in the annular concave part are closely attached to the step surface.

According to one embodiment of the utility model, the side wall is perpendicular to the outer periphery.

According to one embodiment of the utility model, the side wall is provided with at least one annular groove, and the step surface is provided with an annular convex structure matched with the annular groove; the annular groove is used for increasing the adhesion between the step surface and the side wall.

According to one embodiment of the utility model, the hub is provided with a plurality of communication holes, the communication holes are annularly arranged around the axial direction of the hub, and the communication holes communicate the outer periphery with the side wall; the flexible ring is made of rubber, and the flexible ring is filled with the communication hole in the compression molding process, so that the adhesion between the step surface and the side wall is enhanced.

According to one embodiment of the utility model, the flexible ring is provided with a connecting structure which is matched with the communication hole, and the connecting structure is respectively connected with the second inner periphery and the step surface.

According to one embodiment of the utility model, the internal cavity of the communication hole is in a bent pipe shape or an inclined straight pipe shape; the straight pipe shape of slope can reduce the degree of difficulty of wheel hub injection moulding for return bend shape, reduces the complexity of mould.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a perspective view of a plastic pulley assembly according to embodiment 1 of the present utility model;

fig. 2 is a cross-sectional view of a plastic pulley assembly according to embodiment 1 of the present utility model;

FIG. 3 is a perspective view of a hub according to embodiment 1 of the present utility model;

FIG. 4 is a cross-sectional view of the hub of embodiment 1 of the present utility model;

FIG. 5 is a perspective view of the flexible ring of example 1 of the present utility model;

FIG. 6 is a cross-sectional view of the flexible ring of example 1 of the present utility model;

fig. 7 is a cross-sectional view of a plastic pulley assembly according to embodiment 2 of the present utility model;

FIG. 8 is a perspective view of a hub in accordance with embodiment 3 of the present utility model;

FIG. 9 is a cross-sectional view of the hub of embodiment 3 of the present utility model;

FIG. 10 is a schematic view showing another structure of a hub according to embodiment 3 of the present utility model;

FIG. 11 is another cross-sectional view of the hub of embodiment 3 of the present utility model;

fig. 12 is a perspective view of another plastic pulley assembly according to embodiment 1 of the present utility model;

fig. 13 is a schematic structural view of another plastic pulley assembly according to embodiment 1 of the present utility model.

The reference numerals in the figures illustrate:

1. a hub; 2. a flexible ring;

11. a shaft hole; 12. a ring recess; 13. an outer peripheral edge; 14. an annular groove; 15. a communication hole;

12a, annular bottom surface; 12b, sidewalls;

21. a first inner periphery; 22. a second inner periphery; 23. a step surface.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

Example 1

As shown in fig. 1 to 6, there is disclosed in the present embodiment a plastic pulley assembly comprising:

an injection molded hub 1, wherein the periphery of the hub 1 is provided with a ring concave part 12, the bottom of the ring concave part 12 is an annular bottom surface 12a, and the annular bottom surface 12a is arc-shaped along the axial section of the hub 1;

a flexible ring 2 fitted around the hub 1, the flexible ring 2 having a first inner periphery 21 adapted to the ring recess 12.

As shown in fig. 3 and 4, the hub 1 is formed with a shaft hole 11 extending axially therethrough in the present embodiment. The outer periphery 13 of the hub 1 is rounded off from the ends of the hub 1. Wherein the annular recess 12 is formed by a radially inward depression of the outer periphery 13 of the hub 1, i.e. the annular recess 12 is an annular groove structure. The bottom surface of the annular recess 12 is an annular bottom surface 12a, and the annular bottom surface 12a is arc-shaped along the axial cross section of the hub 1.

Further, in the present embodiment, the hub 1 is made of plastic material, which is molded by an injection molding process. The flexible ring 2 is made of polyurethane foam or, in another embodiment, the flexible ring 2 is made of nitrile rubber foam.

As shown in fig. 5 and 6, in this embodiment, the flexible ring 2 is made of rubber, and is manufactured by a compression molding process. The flexible ring 2 has a hollow cylindrical structure as a whole so that the outer circumferential surface of the flexible ring 2 has a cylindrical shape. The two end faces of the flexible ring 2 are recessed inwards along the axial direction to form annular steps, namely the middle area of the flexible ring 2 is a first inner periphery 21, and the inner wall of the annular steps is a second inner periphery 22.

Specifically, as shown in fig. 3 and 4, the thickness between the first inner peripheral edge 21 and the outer peripheral surface of the flexible ring 2 gradually decreases from both sides to the center in the axial direction of the flexible ring 2.

Further, the thickness between the annular bottom surface 12a and the shaft hole 11 is gradually increased from both sides to the center in the axial direction of the hub 1 in the axial cross section of the hub 1, corresponding to the contour structure of the first inner peripheral edge 21.

Specifically, two ends of the flexible ring 2 are provided with second inner peripheral edges 22, the inner diameter of the second inner peripheral edges 22 is matched with the outer peripheral edge 13 of the hub 1, and the joint of the first inner peripheral edge 21 and the second inner peripheral edge 22 forms a step surface 23.

Further, in the compression molding process of the flexible ring 2, the ring recess 12 is filled with the hot paste. The second inner peripheral edge 22 is formed to be in contact with the step surface 23, that is, the side walls 12b on both sides in the axial direction in the annular recess 12 are in contact with the step surface 23. Wherein the side wall 12b is perpendicular to the outer periphery 13.

Referring to fig. 12-13, there is shown a perspective view of another plastic pulley assembly of this embodiment.

Example 2

As shown in fig. 7, this embodiment is different from embodiment 1 in that the flexible ring 2 is further modified on the basis of the structure of the plastic pulley assembly in embodiment 1, an annular groove 14 is provided on the side wall 12b, and the step surface 23 has an annular convex structure adapted to the annular groove 14.

Correspondingly, in the compression molding process of the flexible ring 2, the annular groove 14 is filled with hot glue, and an annular convex structure is molded.

Example 3

As shown in fig. 8 and 9, this embodiment is different from embodiment 1 in that the flexible ring 2 is further modified on the basis of the structure of the plastic pulley assembly in embodiment 1, the hub 1 is provided with eight communication holes 15, the eight communication holes 15 are divided into two groups, each group of communication holes 15 is annularly arranged around the axial direction of the hub 1, and the communication holes 15 communicate the outer peripheral edge 13 with the side wall 12 b.

Further, in the present embodiment, one set of four communication holes 15 each communicates one side wall 12b with the same side outer peripheral edge 13, and the other set of four communication holes 15 each communicates the other side wall 12b with the same side outer peripheral edge 13.

Specifically, the flexible ring 2 has a connection structure adapted to the communication hole 15, and the connection structure is respectively connected to the second inner peripheral edge 22 and the step surface 23, and the internal cavity of the communication hole 15 is in a bent pipe shape.

As shown in fig. 10 to 11, in another embodiment, the internal cavity of the communication hole 15 is in an inclined straight pipe shape, so as to reduce the complexity of the mold for forming the hub 1.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. A plastic pulley assembly, comprising:

the hub (1) is formed by injection molding, the periphery of the hub (1) is provided with a ring concave part (12), the bottom of the ring concave part (12) is an annular bottom surface (12 a), and the annular bottom surface (12 a) is arc-shaped along the axial section of the hub (1);

and the flexible ring (2) is sleeved on the periphery of the hub (1), and the flexible ring (2) is provided with a first inner periphery (21) matched with the ring concave part (12).

2. A plastic pulley assembly according to claim 1, wherein: the flexible ring (2) is made of polyurethane foaming material or nitrile rubber foaming material.

3. A plastic pulley assembly according to claim 2, wherein: the thickness between the first inner periphery (21) and the outer peripheral surface of the flexible ring (2) gradually decreases from two sides to the center along the axial direction of the flexible ring (2).

4. A plastic pulley assembly according to claim 1, wherein: two ends of the flexible ring (2) are provided with second inner peripheral edges (22), the inner diameter of the second inner peripheral edges (22) is matched with the outer peripheral edge (13) of the hub (1), and the joint of the first inner peripheral edges (21) and the second inner peripheral edges (22) forms a step surface (23).

5. A plastic pulley assembly according to claim 4, wherein: the side walls (12 b) at both sides in the axial direction in the ring concave part (12) are closely attached to the step surface (23).

6. A plastic pulley assembly according to claim 5, wherein: the side wall (12 b) is perpendicular to the outer periphery (13).

7. A plastic pulley assembly according to claim 5, wherein: the side wall (12 b) is provided with at least one annular groove (14), and the step surface (23) is provided with an annular bulge structure matched with the annular groove (14).

8. A plastic pulley assembly according to claim 5, wherein: the hub (1) is provided with a plurality of communication holes (15), the communication holes (15) are annularly arranged around the axial direction of the hub (1), and the communication holes (15) are used for communicating the outer periphery (13) with the side wall (12 b).

9. A plastic pulley assembly according to claim 8, wherein: the flexible ring (2) is provided with a connecting structure matched with the communication hole (15), and the connecting structure is respectively connected with the second inner periphery (22) and the step surface (23).

10. A plastic pulley assembly according to claim 8, wherein: the internal cavity of the communication hole (15) is in a bent pipe shape or an inclined straight pipe shape.